JP2005019065A - Backlight device and image display unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a backlight device having high luminance and a high impact resistance and to particularly provide a backlight device suitable for an image display unit made of a large screen, such as a television receiver, etc. <P>SOLUTION: The backlight device includes many linear light sources 5 arranged in parallel with each other in the same plane, a lamp supporter 4 for supporting both ends of the linear light sources, and a light source protector 61 disposed between adjacent linear light sources 5. The light source protector 61 is not brought into contact with the linear light source 5 at a normal time and disposed at a position which is brought into contact with the linear light source 5 deflected by receiving an impact from an exterior. Accordingly, the deflection of the linear light source 5 exceeding a strain limit and collision of the linear light sources 5 with each other are prevented without lowering the luminance and without causing the luminance unevenness. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a backlight device and an image display device, and more particularly, to an improvement of a backlight device used with a transmissive display panel such as a liquid crystal display panel, in particular, a direct type backlight incorporating a large number of linear light sources. The present invention relates to an improvement of a light device.
[0002]
[Prior art]
In general, a liquid crystal display device can be made thinner and lighter than other display devices, and has an excellent feature of low power consumption. For this reason, it is now widely used as an image display device, for example, a computer display device or a portable terminal display device. Furthermore, recently, it is being adopted for television receivers.
[0003]
Unlike a display device such as a CRT (Cathode Ray Tube) or a PDP (Plasma Display Panel), the liquid crystal display device itself does not emit light. For this reason, image display is performed by reflecting or transmitting external light.
[0004]
A liquid crystal display device that selectively reflects extraneous light and displays an image is called a reflective type. A reflective liquid crystal display device does not require a light source and is particularly suitable for a display device such as a portable terminal because of its low power consumption. However, the brightness of the screen depends on the amount of peripheral light. On the other hand, a light source device called a backlight is disposed on the back side of the liquid crystal panel, and a liquid crystal display device that displays images by selectively transmitting the light source light is called a transmissive type, and has a stable and bright screen. Can be realized.
[0005]
As a backlight device used in a transmissive liquid crystal display device, a light source device having a light emitting surface that irradiates an image display area of a liquid crystal panel substantially uniformly and having a thin shape is used. Such backlight devices include a sidelight type and a direct type.
[0006]
In the sidelight type backlight device, a linear light source is disposed at an end portion in the device, and the light source light is reflected inside to be used as a planar light source. On the other hand, in the direct type, a large number of linear light sources are arranged almost uniformly in the light emitting surface and used as a planar light source. For this reason, the sidelight system is advantageous for thinning, but the direct type is advantageous for increasing brightness. That is, when a high-luminance display device is to be realized using a liquid crystal display device, a combination of a transmissive liquid crystal panel and a direct backlight device is used.
[0007]
In general, a television receiver is required to have a high luminance and a large screen as compared with a display device such as a computer or a portable terminal, and the luminance is insufficient when a sidelight type backlight device is used. For this reason, television receivers using a liquid crystal display device are often configured by a combination of a transmissive liquid crystal panel and a direct backlight.
[0008]
Usually, a fluorescent discharge tube is used as a linear light source of a backlight device. It is necessary to use a fluorescent discharge tube having a length corresponding to the screen size. The longer the image display device is, the longer the fluorescent discharge tube is used for the backlight device. For example, in the case of a 30-inch television receiver, a fluorescent discharge tube having a diameter of 3 to 4 mm and a length of 700 mm is used.
[0009]
Since the fluorescent discharge tube is supported at both ends in the backlight device, the longer the fluorescent discharge tube is, the more easily the fluorescent discharge tube is bent due to its own weight or external impact. For this reason, the backlight device for a large screen has a problem that the fluorescent discharge tube is easily damaged. That is, when a large impact acceleration is applied to the backlight device, such as when the liquid crystal display device is dropped, the fluorescent discharge tube bends beyond the distortion limit or comes into contact with the adjacent fluorescent discharge tube. It may be damaged. This tendency becomes more conspicuous as the backlight device for large screens.
[0010]
In order to prevent breakage of the fluorescent discharge tube due to bending, it is conceivable to support the fluorescent discharge tube at other than both ends. However, when the support member is brought into contact with the light emitting portion of the fluorescent discharge tube, the brightness of the fluorescent discharge tube is lowered by lowering the temperature of the contact portion. For this reason, there has been a problem that the luminance of the backlight device is lowered or the luminance is uneven in the display screen.
[0011]
For example, Patent Literature 1 and Patent Literature 2 disclose conventional backlight devices having a structure for preventing breakage of a fluorescent discharge tube. The backlight device of Patent Document 1 improves mechanical stress resistance by embedding a fluorescent discharge tube in a silicone resin. In the backlight device of Patent Document 2, the fluorescent discharge tube is embedded in a silicon rubber lump, thereby elastically supporting the fluorescent discharge tube and preventing the fluorescent discharge tube from being damaged by an impact. However, in these backlight devices, since the silicone resin or silicon rubber is brought into contact with the entire surface of the fluorescent discharge tube, it is considered that the luminance of the fluorescent discharge tube is greatly impaired.
[0012]
[Patent Document 1]
JP-A-5-323312
[Patent Document 2]
JP-A-10-123516
[0013]
[Problems to be solved by the invention]
The present invention has been made in view of the above circumstances, and an object thereof is to improve the impact resistance of a backlight device. It is another object of the present invention to improve the impact resistance of the backlight device without significantly reducing the display quality. For example, an object is to provide a backlight device having high luminance and high impact resistance. It is another object of the present invention to provide a backlight device with little unevenness in luminance and high impact resistance. It is another object of the present invention to provide a backlight device suitable for an image display device having a large screen such as a television receiver.
[0014]
[Means for Solving the Problems]
The backlight device according to the present invention includes a plurality of linear light sources arranged in parallel to each other in the same plane, a lamp support that supports both ends of the linear light source, and a light source disposed between adjacent linear light sources. The light source protection unit is disposed at a position where the linear light source that does not contact with the linear light source in a normal state and does not contact with the linear light source that has been bent by an impact from the outside. With such a configuration, it is possible to prevent or suppress excessive deflection of the linear light sources and collision between the linear light sources without causing a significant decrease in luminance or uneven luminance. Therefore, the impact resistance of the backlight device can be improved without degrading the display quality.
[0015]
Further, the backlight device according to the present invention is configured such that the light source protection unit abuts before the linear light source reaches the distortion limit, and holds the deflection of the linear light source below the distortion limit. With such a configuration, it is possible to prevent the linear light source from being bent beyond the strain limit and to improve the impact resistance.
[0016]
In the backlight device according to the present invention, the light source protection unit is configured to have a shock absorption property in the bending direction of the linear light source. With such a configuration, when a large impact acceleration is applied, the linear light source can be prevented from being damaged due to contact with the light source protection unit.
[0017]
In the backlight device according to the present invention, the light source protection unit is disposed at the center of the linear light source. By providing the light source protection part at the center of the linear light source that maximizes the displacement, it is possible to effectively prevent the linear light source from being damaged.
[0018]
Moreover, the backlight apparatus by this invention consists of a sheet-like member which has the flexibility in which the said light source protection part is arrange | positioned in parallel with the linear light source. With such a configuration, the light source protection device can be easily disposed even when the pitch of the linear light sources is narrow. In addition, with a simple configuration, the light source protection unit can have an appropriate shock absorption.
[0019]
In the backlight device according to the present invention, the light source protection portion has a tapered shape with a width narrowed toward the front side. The light source protection part is made of a high reflectance member having a surface reflectance of 96% or more. With such a configuration, it is possible to make it difficult to visually recognize the light source protection part from the outside, and it is possible to improve the uniformity of the light emitting surface.
[0020]
The backlight device according to the present invention is disposed on the back side of the linear light source and has a thin housing having an opening as a light emitting surface on the front surface, and reflects light emitted from the linear light source to the back side. And the light source protection part is integrally formed with the reflection sheet. With such a configuration, the number of parts can be reduced, and an increase in manufacturing cost due to the addition of the light source protection unit can be suppressed. In particular, it is effective when both the reflection sheet and the light source protection part are made of a material having high reflectance.
[0021]
Further, in the backlight device according to the present invention, the thin casing having an opening as a light emitting surface on the front surface and the light source protection section are integrally formed inside the thin casing. With such a configuration, the number of parts can be reduced, and an increase in manufacturing cost due to the addition of the light source protection unit can be suppressed.
[0022]
An image display device according to the present invention is an image display device including a transmissive display panel that displays an image by controlling transmitted light, and a backlight device arranged on the back side of the transmissive image display panel. This backlight device includes a large number of linear light sources arranged in parallel to each other in the same plane, a lamp support unit that supports both ends of the linear light source, and a light source protection unit disposed between adjacent linear light sources. The light source protection unit is arranged at a position where the linear light source is not in contact with the normal light source but is in contact with the linear light source that is bent by an impact from the outside. With such a configuration, an image display device with high impact resistance can be provided.
[0023]
In the image display device according to the present invention, the transmissive display panel is a liquid crystal display panel. With such a configuration, a liquid crystal display device with high impact resistance can be provided.
[0024]
In the image display device according to the present invention, the linear light sources are arranged in the horizontal direction in the same vertical plane when in use, and the linear light source bent by its own weight contacts the light source protection unit. Configured not to. With such a configuration, it is possible to prevent a decrease in luminance during use by taking into account the bending due to its own weight.
[0025]
Further, in the image display device according to the present invention, the light source protection unit is disposed at a position where the upper linear light source that is bent when dropped is brought into contact. With such a configuration, it is possible to improve the impact property at the time of dropping to which a large impact is applied.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is an exploded perspective view showing a configuration example of a backlight device according to Embodiment 1 of the present invention. The backlight device 1 houses three optical sheets 3, a lamp support 4, a large number of cold cathode ray tubes 5, a spacer unit 6, and a reflection sheet 7 in a housing composed of a front frame 2 and a rear frame 8. Composed.
[0027]
The front frame 2 is made of molded resin and is fitted with the rear frame 8 to constitute a thin casing of the backlight device 1. A rectangular opening 2H is formed on the front surface of the front frame 2, and the opening 2H serves as a light emitting surface (light emitting surface) of the backlight device 1. On the other hand, the rear frame 8 is formed by pressing a metal plate such as aluminum. A drive circuit (not shown) of the cold cathode ray tube 5 including an inverter circuit is provided on the back side (outside) of the rear frame 8, and the metal rear frame 8 shields noise from the drive circuit. .
[0028]
The optical sheet 3 is an optical correction sheet that is disposed in a region corresponding to at least the opening 2H on the inner side of the front surface and uniformizes the emitted light from the light emitting surface or increases the brightness. The optical sheet 3 in the figure includes a diffusion sheet 31 for diffusing outgoing light to make the luminance of the light emitting surface uniform, a prism sheet 32 for improving the luminance by giving directivity to the outgoing light, and a liquid crystal display. It comprises a polarization separation sheet 33 for improving the luminance by reflecting and reusing the polarized component absorbed by the polarizing plate (not shown) of the panel in advance. The backlight device 1 uses one of these sheets or an optical sheet 3 in which two or more are combined as necessary.
[0029]
The cold cathode ray tube 5 is a linear light source having electrodes at both ends, and is a kind of a fluorescent discharge tube that is turned on by applying a voltage equal to or higher than a predetermined discharge start voltage between these electrodes. Generally, a cold cathode ray tube is widely used as a light source for a backlight device because it has a relatively small flicker when it is lit at a high frequency. The backlight device 1 is of a direct type, and a large number of cold cathode ray tubes 5 are arranged almost uniformly in a region corresponding to the light emitting surface.
[0030]
The two lamp support bases 4 are provided on opposite side surfaces of the backlight device 1 and support the cold cathode ray tubes 5 at both ends. That is, in the backlight device 1, the cold cathode ray tube 5 is arranged in a state where only the electrode portions at both ends are fixed by the lamp support 4 and the other portions (particularly light emitting portions) are floated so as not to contact other members. Has been.
[0031]
The surface temperature of the light emitting part of the cold cathode ray tube 5 at the time of lighting is about 50 to 60 ° C. When the temperature of the light emitting part is lowered, the luminance of the cold cathode ray tube 5 is lowered. Therefore, by supporting the cold cathode ray tube 5 only at the electrode portion and preventing other members from coming into contact with the light emitting portion, heat is not taken away from the light emitting portion, and the cold cathode ray tube 5 is lit brightly with the original luminance. Can be made.
[0032]
The reflective sheet 7 is made of a material having a high reflectivity that can be bent, for example, a material having a surface reflectivity of 96% or more. The reflection sheet 7 is bent at both ends, and is disposed on the back surface in the backlight device 1 and the side surface parallel to the cold cathode ray tube 5, and reflects the light emitted from the cold cathode ray tube 5 in a direction other than the light emitting surface. And make it reusable.
[0033]
The spacer unit 6 is composed of a spacer base 60 and spacer pins 61 and 62, both of which use a material having a high reflectance similar to that of the reflection sheet 7, for example, a material having a surface reflectance of 96% or more. The surface reflectance of the spacer pins 61 and 62 is desirably equal to or higher than the surface reflectance of the reflective sheet 7.
[0034]
The spacer pins 61 and 62 are lamp protection portions for preventing the cold cathode ray tube 5 from being damaged, and are arranged in the gap between the adjacent cold cathode ray tubes 5. A large number of spacer pins 61 are integrally formed with a spacer base 60 that defines the interval between the spacer pins 61, and constitute a comb-shaped spacer body. On the other hand, the spacer pin 62 is an independent part from the spacer body and is attached to the rear frame 8.
[0035]
Positioning of the spacer body in the backlight device 1 is performed by penetrating the spacer pin 62 through the spacer pin through hole 7H of the reflective sheet 7 and further through the spacer pin through hole 6H of the spacer body (spacer base 60). ing. The spacer pin 62 that penetrates the spacer pin through-holes 7H and 6H also functions as a lamp protection unit that is exactly the same as the spacer pin 61.
[0036]
That is, in the backlight device 1, the relative position of each spacer pin 61 is defined by the spacer base 60, and the absolute position of the spacer pin 61 in the backlight device 1 is defined by the spacer pin 62.
[0037]
In the case of the backlight device 1 used for a large-screen image display device, even if the cold cathode ray tube 5 is thin and long and the backlight device 1 is placed at a low level, some deflection occurs due to its own weight. . And when an impact is applied to the backlight device 1, a larger deflection occurs. For example, when the image display device is dropped, the cold cathode ray tube 5 in the backlight device 1 is greatly bent.
[0038]
The light-emitting portion occupying most of the cold cathode ray tube 5 is usually made of a thin glass tube and has low flexibility. For this reason, when the cold cathode ray tube 5 bends beyond the strain limit, the glass tube is broken. Further, when adjacent cold cathode ray tubes 5 collide with each other, the glass tube is easily broken. For this reason, the spacer pins 61 and 62 prevent the cold cathode ray tube 5 from exceeding the strain limit, thereby preventing the cold cathode ray tube 5 from being damaged.
[0039]
FIG. 2 is a front view of the backlight device of FIG. 1 as viewed from the light emitting surface side. This figure shows a state when the optical sheet 3 is removed and the inside is viewed from the opening 2H. FIG. 3 is a cross-sectional view of the backlight device of FIG. 1, and shows a cross-sectional view taken along a section I-I perpendicular to the cold cathode ray tube.
[0040]
A part of the light emitted from the circular cross section of the cold cathode ray tube 5 is directly emitted from the opening 2H via the optical sheet 3. Most of the other light is also reflected by the reflective sheet 7 and the spacer unit 6 having a high reflectivity and then emitted from the opening 2H via the optical sheet 3.
[0041]
In order to uniformly arrange the cold cathode ray tubes 5 that are linear light sources in the region corresponding to the opening 2H, the cold cathode ray tubes 5 having a length corresponding to the width of the opening 2H are opened at a predetermined interval. It arrange | positions in the width direction of the part 2H. That is, a large number of cold cathode ray tubes 5 are arranged in the same plane parallel to the light emitting surface so as to be parallel to each other at a predetermined interval.
[0042]
Spacer pins 61 and 62 are arranged in the gaps between the cold cathode ray tubes 5. These spacer pins 61 and 62 are arranged at an appropriate distance from the cold cathode ray tube 5. That is, the cold cathode ray tube 5 is not in contact with the cold cathode ray tube 5 at normal times, and when the backlight device 1 is subjected to an impact or vibration, the bent cold cathode ray tube 5 is disposed at a position where it contacts.
[0043]
A large image display device used in a television receiver or the like is usually used in a stationary state (resting state) installed in a stable place. Therefore, the backlight device used in this type of image display device is also usually used in a standing state, and it is required to ensure a desired light emission quality in such a state of use.
[0044]
By arranging the spacer pins 61 and 62 at positions where they do not contact the cold cathode ray tube 5, the normal cold cathode ray tube 5 is supported only by the lamp support 4 at both ends, and the other light emitting portions are optical. The sheet 3, the spacer unit 6, the reflection sheet 7, and the like are not in contact with peripheral members and are in a state of floating in the hollow. For this reason, the cold cathode ray tube 5 can be lighted with high brightness without lowering the temperature of the light emitting section.
[0045]
On the other hand, the spacer pins 61 and 62 are arranged at positions where the cold cathode ray tube 5 which is bent by applying a large impact acceleration to the backlight device 1 contacts. For this reason, it is possible to suppress the cold cathode ray tubes 5 from being excessively bent, or to prevent the cold cathode ray tubes 5 from colliding with each other. Accordingly, it is possible to prevent the cold cathode ray tube 5 from being damaged when an impact or vibration is applied to the backlight device 1.
[0046]
The spacer pins 61 and 62 are made of a thin member (sheet-like member) having flexibility, and are arranged so as to be parallel to the cold cathode ray tube 5. By using sheet-like members for the spacer pins 61 and 62, the spacer pins 61 and 62 can be easily inserted into the gaps of the cold cathode ray tube 5 even when the pitch of the cold cathode ray tube 5 is short.
[0047]
Further, since the spacer pins 61 and 62 are flexible in addition to the sheet shape, the cold cathode ray tube 5 is prevented from being damaged when the cold cathode ray tube 5 comes into contact with the spacer pins 61 and 62. ing. That is, the spacer pins 61 and 62 have shock absorption in the bending direction of the cold cathode ray tube 5, and absorb the shock when the bent cold cathode ray tube 5 contacts the spacer pins 61 and 62. Normally, the cold cathode ray tube 5 has a weight of about several grams, and if a flexible sheet-like member is used as the spacer pins 61 and 62, the shock-absorbing property is such that the cold cathode ray tube 5 is not damaged by contact. While being provided, the bending of the cold cathode ray tube 5 can be suppressed.
[0048]
Furthermore, the spacer unit 6 is disposed in the direction orthogonal to the cold cathode ray tube 5 at the approximate center of the opening 2H. For this reason, the spacer pins 61 and 62 are arranged at the center of the cold cathode ray tube 5 where the amount of displacement of the light emitting part due to the bending becomes the largest, and excessive bending of the cold cathode ray tube 5 and collision between the cold cathode ray tubes 5 are caused. Can be effectively suppressed.
[0049]
For example, when a television receiver is accidentally dropped, a large impact acceleration is applied to the backlight device built in the television receiver. In such a case, in the conventional backlight device, the internal cold cathode ray tube may be damaged. However, in the backlight device 1, the spacer pins 61 and 62 protect the cold cathode ray tube 5 and are not easily damaged. Become.
[0050]
FIG. 4 is a cross-sectional view of the backlight device of FIG. 1, and shows a cross-sectional view taken along a section II-II parallel to the cold cathode ray tube. Each spacer pin 61, 62 has a tapered shape in which the width on the front side is narrower than the width on the back side, and is supported by the spacer base 60 or the rear frame 8 on the back side, and the front side extends to the vicinity of the optical sheet 3. ing.
[0051]
When the spacer pins 61 and 62 are visually recognized from the outside, the luminance is uneven. However, by using a sheet-like member as the spacer pins 61 and 62, the spacer pins 61 and 62 can be made difficult to visually recognize from the outside. In particular, since it is the front side of the spacer pins 61 and 62 close to the light emitting surface that is easily visible from the outside, it is possible to make it difficult to see from the outside by reducing the width of the front side. As such a shape, the triangular shape shown in the figure is preferable, but other shapes may be used.
[0052]
The spacer pins 61 and 62 can be extended to the vicinity of the optical sheet 3 or brought into contact with each other to support the optical sheet by the spacer pins 61 and 62. That is, it is possible to prevent the central portion of the optical sheet from being bent toward the inside of the backlight device 1.
[0053]
FIG. 5 is a schematic diagram illustrating a configuration example of a television receiver using the backlight device of FIG. This image display device includes a liquid crystal panel 10 as a transmissive image display panel and a backlight device 1. A normal television receiver is housed in a casing together with other peripheral circuits and the like, but is omitted from FIG.
[0054]
The backlight device 1 is attached to the back side of the liquid crystal panel 10 with its light emitting surface aligned with the image display area of the liquid crystal panel 10. In the normal use state of the television receiver, the cold cathode ray tubes 5 in the backlight device 1 are arranged in the horizontal direction within the same vertical plane. For this reason, the cold cathode ray tube 5 in use is in a state of being slightly bent due to its own weight.
[0055]
FIG. 6 is an explanatory diagram for explaining the distance between the spacer pins 61 and 62 and the cold cathode ray tube 5. The cold cathode ray tube 5 is indicated by a wavy line and a solid line, and is a position when the wavy line is not bent and a position when the solid line is bent by its own weight. L1 is the amount of displacement at the center of the cold cathode ray tube 5 bent by its own weight. L2 is the distance between the cold cathode ray tube 5 and the spacer pin 61 adjacent to the lower side thereof, and L3 is the distance between the cold cathode ray tube 5 and the spacer pin 61 adjacent to the upper side thereof.
[0056]
The spacer pin 61 is disposed at a position where the cold cathode ray tube 5 bent by its own weight does not come into contact. That is, the spacer pin 61 is disposed at a position farther from the cold cathode ray tube 5 without bending than L1. In the case of a cold cathode ray tube 5 for a 30-inch television receiver, L1 is about 1 mm.
[0057]
In addition, when the cold cathode ray tube 5 adjacent on the upper side is bent due to an impact, the spacer pin 61 is disposed at a position where the cold cathode ray tube 5 abuts before exceeding the distortion limit. That is, the distance L2 from the cold cathode ray tube 5 without bending to the lower spacer pin 61 is shorter than the strain limit of the cold cathode ray tube 5. In the case of the cold cathode ray tube 5 for a 30-inch television receiver, according to experiments, the distortion limit is about 20 to 30 mm, so it is desirable that L2 <20 mm.
[0058]
The distance L3 between the spacer pin 61 and the cold cathode ray tube 5 adjacent to the lower side is determined by the pitch at which the cold cathode ray tube 5 is disposed. When the television receiver is dropped, a large impact acceleration is applied upward at the time of landing, and the light emitting portion of the cold cathode ray tube 5 floating in the air is greatly bent downward. Therefore, in this case, the distance between the cold cathode ray tube 5 and the spacer pin 61 on the lower side is particularly important. When the pitch of the cold cathode ray tube 5 is preferentially determined, the spacer in use is used. The pin 61 may not be in contact with the lower cold cathode ray tube 5.
[0059]
However, in the case where a reverse impact acceleration is applied, for example, when dropping in an upside down state or when a large vibration is applied during transportation, the distance L3 is the same as the distance L2. It is desirable to satisfy That is, the distance L3 is desirably a distance shorter than the strain limit of the cold cathode ray tube 5.
[0060]
Although the distance between the spacer pin 61 and the cold cathode ray tube 5 has been described here, the distances L2 and L3 between the spacer pin 62 and the cold cathode ray tube 5 are exactly the same, and the description thereof is omitted.
[0061]
Embodiment 2. FIG.
FIG. 7 is a perspective view showing a configuration example of a main part of the backlight device according to the second embodiment of the present invention, and shows a reflection sheet 7 in which spacer pins 61 are integrally formed.
[0062]
Since both the spacer pin 61 and the reflection sheet 7 are made of a material having a high reflectance, the number of parts can be reduced and the manufacturing cost can be reduced by integrally molding. In FIG. 7, the spacer pin 62 is not used, but when the reflection sheet 7 cannot be accurately positioned, the spacer sheet through hole 7 </ b> H is provided in the reflection sheet 7 as in the case of the first embodiment. The spacer pins 62 attached to the rear frame 8 may be positioned through. Other configurations are the same as those in the first embodiment.
[0063]
Embodiment 3 FIG.
FIG. 8 is a perspective view showing a configuration example of a main part of the backlight device according to Embodiment 3 of the present invention, and shows a rear frame 8 in which spacer pins 61 are integrally formed.
[0064]
When the rear frame 8 is formed by resin molding, by integrally molding the spacer pin 61 and the rear frame 8, the number of parts can be reduced and the manufacturing cost can be reduced. If the inner surface of the rear frame 8 has a high reflectance, the reflection sheet 7 becomes unnecessary and the number of parts can be further reduced.
[0065]
【The invention's effect】
According to the present invention, the light source protection unit is provided at a position between adjacent linear light sources, where the linear light sources do not normally contact but a linear light source bent by an impact from the outside contacts. As a result, the impact resistance of the backlight device can be improved without substantially reducing the luminance of the linear light source. Therefore, it is possible to provide a backlight device that achieves both display quality and impact resistance. In addition, by using such a backlight, the impact resistance of the image display device can be improved.
[0066]
In particular, impact resistance can be remarkably improved in a large-screen image display device in which a relatively long linear light source is used for the backlight device. In addition, since the impact resistance can be improved without reducing the luminance, a backlight device suitable for a television receiver or the like that is required to have a large screen and high luminance can be obtained.
[0067]
Further, according to the present invention, it is possible to provide a backlight device and an image display device with improved impact resistance at a low cost.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a configuration example of a backlight device according to Embodiment 1 of the present invention.
2 is a front view of the backlight device of FIG. 1 as viewed from the light emitting surface side.
FIG. 3 is a cross-sectional view of the backlight device 1 taken along a cutting plane II perpendicular to the cold cathode ray tube.
FIG. 4 is a cross-sectional view of the backlight device 1 taken along a cutting plane II-II parallel to the cold cathode ray tube.
FIG. 5 is a schematic diagram illustrating a configuration example of a television receiver using the backlight device of FIG. 1;
FIG. 6 is an explanatory diagram for explaining the distance between the spacer pins 61 and 62 and the cold cathode ray tube 5;
FIG. 7 is a perspective view showing a configuration example of a main part of a backlight device according to Embodiment 2 of the present invention.
FIG. 8 is a perspective view showing a configuration example of a main part of a backlight device according to Embodiment 3 of the present invention.
[Explanation of symbols]
1 Backlight device
2 Front frame
2H opening
3 Optical sheet
4 Lamp support
5 Cold cathode ray tube
6 Spacer pin
6H Spacer pin through hole
6 Spacer unit
7 Reflective sheet
7H Spacer pin through hole
8 Rear frame
10 LCD panel
31 Diffusion sheet
32 Prism sheet
33 Polarized light separation sheet
60 Spacer base
61, 62 Spacer pin

Claims (13)

A large number of linear light sources arranged parallel to each other in the same plane;
A lamp support for supporting both ends of the linear light source;
A light source protection unit disposed between adjacent linear light sources,
The backlight device according to claim 1, wherein the light source protection unit is disposed at a position where the linear light source is not in contact with the light source in a normal state but is in contact with a linear light source that is bent by an impact from the outside. The backlight device according to claim 1, wherein the light source protection unit abuts before the linear light source reaches the distortion limit, and holds the deflection of the linear light source below the distortion limit. The backlight device according to claim 1, wherein the light source protection unit has a shock absorption property in a bending direction of the linear light source. The backlight device according to claim 1, wherein the light source protection unit is disposed at a central portion of the linear light source. The backlight device according to claim 1, wherein the light source protection unit includes a flexible sheet-like member disposed in parallel with the linear light source. The backlight device according to claim 5, wherein the light source protection unit has a tapered shape with a width narrowed toward the front side. The backlight device according to claim 5, wherein the light source protection unit is made of a high reflectance member having a surface reflectance of 96% or more. A thin housing having an opening on the front surface as a light emitting surface;
A large number of linear light sources arranged parallel to each other in the same plane parallel to the light emitting surface;
A reflective sheet for reflecting the light emitted from the linear light source to the back side, arranged on the back side of the linear light source;
A lamp support for supporting both ends of the linear light source;
A light source protection unit disposed between adjacent linear light sources,
The light source protection unit is integrally formed with the reflection sheet, and is normally disposed at a position where the linear light source is not in contact but is in contact with the deflected linear light source due to an external impact. Backlight device to do. A thin housing having an opening on the front surface as a light emitting surface;
A large number of linear light sources arranged parallel to each other in the same plane parallel to the light emitting surface;
A lamp support for supporting both ends of the linear light source;
A light source protection unit disposed between adjacent linear light sources,
The light source protection part is integrally molded inside the back side of the thin casing, and is normally disposed at a position where the linear light source is not in contact but is in contact with the bent linear light source due to an external impact. A backlight device characterized by that. In an image display device comprising a transmissive display panel for controlling transmitted light and displaying an image, and a backlight device disposed on the back side of the transmissive image display panel,
The backlight device includes a plurality of linear light sources arranged in parallel to each other in the same plane, a lamp support unit that supports both ends of the linear light source, and a light source protection unit disposed between adjacent linear light sources. And
The image display device according to claim 1, wherein the light source protection unit is arranged at a position where a linear light source is not in contact with the light source in a normal state and a linear light source bent by an impact from the outside contacts. The image display apparatus according to claim 10, wherein the transmissive display panel is a liquid crystal display panel. Each of the linear light sources is arranged in the horizontal direction in the same vertical plane when in use,
The image display device according to claim 10, wherein the light source protection unit does not contact a linear light source bent by its own weight. The image display device according to claim 12, wherein the light source protection unit is disposed at a position where the upper linear light source bent when dropped is in contact.

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